Lithium Metal Battery Protective Layer for Edge Deposition Control
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Solution Overview
Problem
Lithium metal secondary batteries face impaired charging and discharging efficiencies and electrode deformation due to uneven lithium metal deposition on the outer peripheral surfaces of the intermediate layer along the stacking direction, leading to increased resistivity and destabilization.
Innovation Solution
A lithium metal secondary battery configuration with a negative electrode layer, a solid electrolyte layer, and an intermediate layer, where at least one outer peripheral surface of the intermediate layer is covered with a protective layer having ionic conductivity but no electron conductivity, effectively suppressing lithium metal deposition on these surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an intermediate layer is provided between the negative electrode layer and the solid electrolyte layer, then lithium metal deposition on the interface can be suppressed, but lithium metal deposits on the outer peripheral surfaces of the intermediate layer causing impaired charging and discharging efficiencies
Solution Approach 1:
The battery structure is segmented into distinct functional layers: the intermediate layer (with Li ion conductivity and electron conductivity) handles interface stabilization, while the protective layer (with Li ion conductivity but no electron conductivity) handles peripheral surface protection. This segmentation allows each layer to perform its specific function without interference, preventing lithium metal deposition on both the interface and outer peripheral surfaces simultaneously.
Solution Approach 2:
The protective layer acts as an intermediary barrier between the intermediate layer and the external environment. It mediates the contradiction by blocking electron transport to the outer peripheral surfaces (preventing lithium deposition) while maintaining Li ion conductivity (preserving charging/discharging efficiency). The protective layer's unique dual properties make it an ideal mediator for this specific problem.
2Reliability
If an intermediate layer is provided between the negative electrode layer and the solid electrolyte layer, then lithium metal deposition on the interface can be suppressed, but uneven deposition of lithium metal causes destabilization and deformation
Solution Approach 1:
The battery structure is segmented into distinct functional layers: the intermediate layer (with Li ion conductivity and electron conductivity) handles interface stabilization, while the protective layer (with Li ion conductivity but no electron conductivity) handles peripheral surface protection. This segmentation allows each layer to perform its specific function without interference, preventing lithium metal deposition on both the interface and outer peripheral surfaces simultaneously.
Solution Approach 2:
The protective layer acts as an intermediary barrier between the intermediate layer and the external environment. It mediates the contradiction by blocking electron transport to the outer peripheral surfaces (preventing lithium deposition) while maintaining Li ion conductivity (preserving charging/discharging efficiency). The protective layer's unique dual properties make it an ideal mediator for this specific problem.
3Productivity
If the intermediate layer is made conductive to facilitate lithium ion transport, then charging efficiency improves, but electron conductivity causes lithium metal deposition on outer surfaces
Solution Approach 1:
The battery structure is segmented into distinct functional layers: the intermediate layer (with Li ion conductivity and electron conductivity) handles interface stabilization, while the protective layer (with Li ion conductivity but no electron conductivity) handles peripheral surface protection. This segmentation allows each layer to perform its specific function without interference, preventing lithium metal deposition on both the interface and outer peripheral surfaces simultaneously.
Solution Approach 2:
The protective layer acts as an intermediary barrier between the intermediate layer and the external environment. It mediates the contradiction by blocking electron transport to the outer peripheral surfaces (preventing lithium deposition) while maintaining Li ion conductivity (preserving charging/discharging efficiency). The protective layer's unique dual properties make it an ideal mediator for this specific problem.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly reduces lithium metal deposition on the outer peripheral surfaces of the intermediate layer, enhancing charging and discharging efficiencies, maintaining interface adhesiveness, and improving the battery's durability and energy density.
Implementation Method 1
the protective layer has ionic conductivity and no electron conductivity
Implementation Method 2
the protective layer has ionic conductivity and no electron conductivity
Implementation Method 3
an intermediate layer, a solid electrolyte layer
Data Source
AI summary
Provided is a lithium metal secondary battery having a negative electrode layer, a solid electrolyte layer, and an intermediate layer therebetween, which can suppress the deposition of lithium metal on outer peripheral surface(s) of the intermediate layer along the stacking direction. The lithium metal secondary battery has a negative electrode layer including a lithium metal layer, an intermediate layer, a solid electrolyte layer, and a positive electrode layer stacked in this order, in which at least one of outer peripheral surfaces of the intermediate layer along the stacking direction abuts against and is covered with a protective layer, and the protective layer has ionic conductivity and no electron conductivity.